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Title: PROBING THE MAGNETISM IN THE CEMIN_5 HEAVY FERMION SYSTEMS BY NMR

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1238122
Report Number(s):
LA-UR-07-1626
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: THE INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS ; 200705 ; HOUSTON
Country of Publication:
United States
Language:
English

Citation Formats

CURRO, NICHOLAS J., URBANO, RICARDO R., and YOUNG, BEN-LI. PROBING THE MAGNETISM IN THE CEMIN_5 HEAVY FERMION SYSTEMS BY NMR. United States: N. p., 2007. Web.
CURRO, NICHOLAS J., URBANO, RICARDO R., & YOUNG, BEN-LI. PROBING THE MAGNETISM IN THE CEMIN_5 HEAVY FERMION SYSTEMS BY NMR. United States.
CURRO, NICHOLAS J., URBANO, RICARDO R., and YOUNG, BEN-LI. Mon . "PROBING THE MAGNETISM IN THE CEMIN_5 HEAVY FERMION SYSTEMS BY NMR". United States. doi:. https://www.osti.gov/servlets/purl/1238122.
@article{osti_1238122,
title = {PROBING THE MAGNETISM IN THE CEMIN_5 HEAVY FERMION SYSTEMS BY NMR},
author = {CURRO, NICHOLAS J. and URBANO, RICARDO R. and YOUNG, BEN-LI},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 12 00:00:00 EDT 2007},
month = {Mon Mar 12 00:00:00 EDT 2007}
}

Conference:
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  • The interplay between magnetism and superconductivity in heavy fermion systems is discussed and the role of muon spin relaxation in elucidating these properties is emphasized. Relevant properties of all six heavy fermion superconductors are briefly surveyed and instances where superconductivity and magnetism compete, coexist and couple with one another are pointed out. Current theoretical concepts underlying these phenomena are highlighted.
  • The crystal structure of the recently discovered heavy-fermion (HF) superconductor CeCoIn{sub 5} (T{sub c} = 2.3 K) has been determined by high-resolution neutron powder diffraction. It is tetragonal (space group P4/mmm), with lattice parameters a = 4.61292(9) {angstrom} and c = 7.5513(2) {angstrom} at ambient conditions. Whereas CeCoIn{sub 5} is isostructural with the HF aniferromagnet CeRhIn{sub 5} and the HF superconductor CeIrIn{sub 5}, its cell constants and its only variable positional parameter, zIn2, differ significantly from the corresponding ones of CeRhIn{sub 5} and CeIrIn{sub 5}. As a result, the distortions of the cuboctahedron [CeIn{sub 3}], which is the key structuralmore » unit in all three materials, are different in CeCoIn{sub 5} from the ones in CeRhIn{sub 5} and CeIrIn{sub 5}. The compounds CeCoIn{sub 5} and CeIrIn{sub 5}, which contain the most distorted (in one or another way) [CeIn{sub 3}] cuboctahedra exhibit superconductivity at ambient pressure below 2.3 K and 0.4 K, respectively. On the other hand, CeRhIn{sub 5}, in which [CeIn{sub 3}] cuboctahedra are the less distorted, and the cubic HF CeIn{sub 3} are antiferromagnets at ambient pressure with T{sub N} = 3.8 K and 10 K respectively; they become superconductors under pressure of 16 kbar and 25 kbar with T{sub c} = 2.1 and 0.2 K respectively.« less
  • The authors discuss some consequences of the interplay between magnetism and superconductivity in the two heavy fermion systems URu{sub 2}Si{sub 2} and UPt{sub 3}, notably on the temperature dependence of the specific heat, on possible observation of Larkin-Ouchinnikov-Fulde-Ferrel phase, and on the anisotropy of the upper critical field. The authors demonstrate that in UPt{sub 3}, a clear double steep superconducting transition can be obtained reversibly.
  • The authors present measurements of the elastic constants in high magnetic fields of heavy fermion systems. B-T phase diagrams of heavy fermion superconductors up to 23 T and temperatures down to 60 mK were determined. In contrast to the Uranium systems UPt{sub 3}, URu{sub 2}Si{sub 2} and UPd{sub 2}Al{sub 3} where the superconductivity coexists with antiferromagnetic order the situation in CeCu{sub 2}Si{sub 2} is quite different. Here the superconducting phase expells the surrounding A-phase which has magnetic and structural signatures.